Elon Musk will become the world's first trillionaire.

ELON Musk started SpaceX in a warehouse, but on Friday the company moved far beyond its humble beginnings, making the biggest stock market debut in history and putting a price tag of $1.77 trillion on the rocket and satellite firm.

The listing places SpaceX among the world’s most valuable technology companies and shows just how strong demand has become from investors betting on the future of space travel and satellite internet systems like Starlink.

Speaking from Texas, Musk said it was “hard to believe”, adding that he had once given the company “less than a 10% chance of succeeding.”

Investors had been waiting for months for the listing, which opened at $135 per share in one of the most closely watched debuts in recent market history. It quickly started trading at $150 a share. Before the launch, SPACEX said that they would sell more than 555 million shares.